package org.example.everyday;

import javax.swing.*;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class Lc76 {

    Map<Character, Integer> ori = new HashMap<Character, Integer>();
    Map<Character, Integer> cnt = new HashMap<Character, Integer>();


    public static void main(String[] args) {
        Lc76 lc76 = new Lc76();
        String s = "ADOBECODEBANC", t = "ABC";
        String result = lc76.minWindow(s,t);
        System.out.println(result);
    }

    public String minWindow(String s, String t) {
        int tLen = t.length();
        for(int i = 0; i < tLen; i++){
            char c = t.charAt(i);
            ori.put(c,ori.getOrDefault(c,0)+1);
        }
        int l = 0, r = -1;
        int len = Integer.MAX_VALUE, ansL = -1,ansR = -1;
        int sLen = s.length();
        while (r < sLen){
            ++r;
            if(r < sLen && ori.containsKey(s.charAt(r))){
                cnt.put(s.charAt(r),cnt.getOrDefault(s.charAt(r),0) + 1);
            }
            while (check() && l <= r){
                if(r - l + 1 < len){
                    len = r - l + 1;
                    ansL = l;
                    ansR = l + len;
                }
                if(ori.containsKey(s.charAt(l))){
                    cnt.put(s.charAt(l),cnt.getOrDefault(s.charAt(l),0) - 1);
                }
                ++l;
            }
        }
        return ansL == -1?"":s.substring(ansL,ansR);
    }

    private boolean check() {
        Iterator iter = ori.entrySet().iterator();
        while (iter.hasNext()){
            Map.Entry entry = (Map.Entry)iter.next();
            Character key = (Character)entry.getKey();
            Integer val = (Integer)entry.getValue();
            if(cnt.getOrDefault(key,0) < val){
                return false;
            }
        }
        return true;
    }


}
